Someone who is douchey, annoying, or ridiculous. Can be used as either an adjective, verb, or noun (in all cases, usually derogatory)
Noun: usually someone is being a "Joel Baez" when they do something douchey, annoying, or ridiculous
Adjective: Used to describe an action that was Joel Baez-esque
Verb: a dance move where one slides their hands across each other (1 inch apart, facing each other) above their thigh. *Note: keep it real tight and slow*

(n.) "Amanda, stop being such a Joel Baez"
(adj.) "Wow, what a Joel Baez move"
(v.) "Hey, I didn't know we were Joel Baez-ing; I've been doing the sprinkler!"